Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual data possui uma pontuação de 6–4, 6–3?
 ###Tabelas: CREATE TABLE tourism (tourism_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Tourist arrivals (2011) (Millions) VARCHAR, Tourism receipts (2011) (Millions of US$) INT, Tourism receipts (2011) (US$ per arrival) INT, Tourism receipts (2011) (US$ per capita) INT, Tourism receipts (2003) (as % of GDP) VARCHAR, Tourism receipts (2003) (as % of exports) VARCHAR, Direct and indirect employment in tourism (2005) (%) VARCHAR, Tourism competitiveness (2011) (TTCI) VARCHAR) CREATE TABLE doubles_21_13–8 (doubles_21_13–8_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score VARCHAR) CREATE TABLE final_wildcards (final_wildcards_id AUTO_INCREMENT PRIMARY KEY, Draw INT, Artist VARCHAR, Song VARCHAR, Televote VARCHAR, Place INT) CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Replaced by VARCHAR, Date of appointment VARCHAR) CREATE TABLE record_vs._sec_opponents (record_vs._sec_opponents_id AUTO_INCREMENT PRIMARY KEY, Missouri vs. VARCHAR, Overall Record VARCHAR, at Columbia VARCHAR, at Opponent's Venue VARCHAR, at Neutral Site VARCHAR, Last 5 Meetings VARCHAR, Last 10 Meetings VARCHAR, Current Streak VARCHAR, Since Joining SEC VARCHAR)  
SELECT Date FROM doubles_21_13–8 WHERE Score = 6–4, 6–3